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(Reuters) - Merck & Co will bring back one of its veterans to head research and development, replacing retiring Peter Kim, who leaves behind a mixed record over the past decade at the drugmaker's highly respected laboratories. Merck, after recent setbacks for some of its most important experimental drugs, said former Amgen Inc research chief Roger Perlmutter will take over from Kim on April 15, although Kim, 55, will stay on as a company advisor until August. ...